Brown spots on leaves show up after overfeeding

Nutrients
1

I’m growing a sour diesel auto plant. I take it outside during the day and inside at night under lights. plant gets about 18 hours of light per day.

I over fed this plant with too much foxfarm three part. the leaves turned to a claw.
I flushed it and checked the next day. Claw effect was much better but now I see brown spots on some of the older leaves.

pic of the leaf: Imgur: The magic of the Internet

What is causing this?

2

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